Ferroconcrete ribbed ceiling.



H. A, WRISSENBERG.

EERROGONGRETE RIBBED CEILING,

APlLlQA'-ION P21153) EL3. l, 1910.

D Patented Apr. 3G, 1912.

"nnrrrm srarns rarnn THE FIRM or GEBRDER BLKEN, 'EISENETvoN-HOHLDECKEN-PATEN'EE SYSTEM UJBSSENBERG, OF BREMEN, GERMANY.

FERROCONCRETE RIBBED CEXLNG.

Specification of Letters Patent.

.Application filed February 1, 1,910. Seral No. M1379.

.f o nu imam it may conf-em:

Be it known that I, JULIS Huisman AL- BERT "Wurssunnnuo, a subject of the Emperor of Germany, residing at Georgstrasse, Bremen, in the German Empire, have invented an Improved Ferroconcrete Ribbed Ceiling and Like Structure, of which the following is a specification.

lhile,heretofore hollow bodies have been placed in ferro-concrete ribbed ceilings, the

forming the plain under surface of the oeil# ing'. ".lhe hollow bodies are secured immer-H ably in position. Bly properly apportionthe lintervals between the pairs of hol- `l nes, the layery eau be arranged for rD stra/ins ,to a remarkable extent. .-lo pover, in doing 'this r1t is not necessary i to holler: bodies prepared especially for each veiling', nor is it mandatory that eertain unitwidt'hs be employed in the bodies. The invention herein described, therefore, presents a. iride range ot adaptabilities and ap''ilieable to anydimensions which, by cale .lation arefoundavorable, yetthe invention contemplates the employment of only sueh building/materials as may be obtained'. readily 'and cheaply almost anyL whereg. The spaces between the pairs ot hollow bodies till `with sounddeadening materials, s o arranged as to serve as permanent snp ports for adjacent parts. The conneetion from one of the hollow7 bodies to the other is made in a very simple and efeetiif'e manner, to nut: by olamps partially surrounding the hollow bodies and provided with an indentation for the purpose of receiving the iron insertion members.

The invention is illustrated in the aecompanying drawing; in o'liielir" i Figure l' is erossfsection and big. a

longitudinal section ot the novel ferro-concrete ribbed ceiling. Fig. 3 represents a closing strut for the tubes serving to lill the cavities, in side and end elevation. Fig. 4 isa cross section through a seeondconstructional forml of the ceiling.

A layer of cement or slag concrete a is built in engagement with a casing, so as to produce a smooth under surface. Thin tubes 7) of sheet met-al or pasteboard are now arranged in'pairs and laid upon the member a and secured together by clamps c. The spaces between the pairs of tubes are apportioned according' to eironmstanees, aeeording' to the room available between the ribs, and are liled with' some suitable filling material it which is a. bad conductor of sound. In the spaces between the tubes of each pair, the ribs Z of the concrete ceiling are made by ramming the concrete. The concrete port-ion o'l the ceiling is rammed on the filling mate ial and the ribs. :The bearer members oi" the ceiling are therefore exclusively the ribs zZ in conjunction with the thrust member c. rihe thin sheet metal or the like tubes are not exposed to any strains but merely to serve as an envelop for the rigs. Thin light tubes which een be extended teleseopieally merely byinserting them one Within ,the other are specially adapted for this purpose; they are assembled in pairs by clamps #because the pairs can be arranged at any desired intervals, While it would cause diiiicult-ies to make molded slabs of any desired Width. The clamps embrace the adjacent tubes o and are formed with indentations inthe known manne-f' ,so that they hold. the spacing irons beteren die tubes in the statieallyl correct position. The sheet metal or pastoboard tubes` b eanvbe folded readily and at a small oost atv the head ends, this arrangement presenting the advantage that the cross section ot the tube becomes gradually smaller toward the head ends so that suitable reinforcements of the layer of concrete are formed at the bearing points of the ceiling plates. An important improvement is attainable by employing as the filling materiel a light concrete material sueh as ,sl -eonerete forming the entire ot the eeiling, whichy embraces tubes' above by means or' proihown .in Fig. 4l?. The to a certain extent of Patented, npr. Si), MM2.

um i@ no angie? The l su laver me 'thus 21m- .Jing a pai? of nl @unirsi tha heling u? 'l Yihad, com@ smid naemmrs bc 5 members @i one Emailed rn ih@ :members of h- L pair., f1 Hu memb' @gnature 

